Packing Technique Research Articles

Simplified management of epistaxis.

Primary care, urgent care, and emergency department providers periodically treat epistaxis, either as recurrent nosebleed or an acute persistent episode. Silver nitrate application to the decongested and anesthetized nasal mucosa addresses the former in most cases. The plethora of commercial nasal packing devices testifies to the discomfort, technical difficulty, and frustration associated with traditional gauze-packing methods. Inflatable anterior nasal balloon packs reliably control most nosebleeds. Addition of a Foley catheter nasopharyngeal balloon pack manages most posterior epistaxis. Cautery and the two packing techniques mentioned above should treat most cases not requiring otolaryngology consultation or interventional radiology. Appropriate anesthetic and analgesics lessen the unpleasantness for both the patient and the provider. Topical moisturizing facilitates mucosal healing. Oxymetazoline 0.05% nasal spray provides the patient means to address rebleeding after discharge from treatment.

High-speed playback of spatiotemporal division multiplexing holographic 3D video stored in a solid-state drive using a digital micromirror device

We propose a high-speed playback method for the spatiotemporal division multiplexing electroholographic three-dimensional (3D) video stored in a solid-state drive (SSD) using a digital micromirror device. The spatiotemporal division multiplexing electroholography prevents deterioration in the reconstructed 3D video from a 3D object comprising many object points. In the proposed method, the stored data is remarkably reduced using the packing technique, and the computer-generated holograms are played back at high speed. Consequently, we successfully reconstructed a clear 3D video of a 3D object comprising approximately 1,100,000 points at 60 frames per second by reducing the reading time of the stored data from an SSD.

A New Malware Classification Framework Based on Deep Learning Algorithms

Recent technological developments in computer systems transfer human life from real to virtual environments. Covid-19 disease has accelerated this process. Cyber criminals’ interest has shifted in a real to virtual life as well. This is because it is easier to commit a crime in cyberspace rather than regular life. Malicious software (malware) is unwanted software which is frequently used by cyber criminals to launch cyber-attacks. Malware variants are continuing to evolve by using advanced obfuscation and packing techniques. These concealing techniques make malware detection and classification significantly challenging. Novel methods which are quite different from traditional methods must be used to effectively combat with new malware variants. Traditional artificial intelligence (AI) specifically machine learning (ML) algorithms are no longer effective in detecting all new and complex malware variants. Deep learning (DL) approach which is quite different from traditional ML algorithms can be a promising solution to the problem of detecting all variants of malware. In this study, a novel deep-learning-based architecture is proposed which can classify malware variants based on a hybrid model. The main contribution of the study is to propose a new hybrid architecture which integrates two wide-ranging pre-trained network models in an optimized manner. This architecture consists of four main stages, namely: data acquisition, the design of deep neural network architecture, training of the proposed deep neural network architecture, and evaluation of the trained deep neural network. The proposed method tested on Malimg, Microsoft BIG 2015, and Malevis datasets. The experimental results show that the suggested method can effectively classify malware with high accuracy which outperforms the state of the art methods in the literature. When proposed method tested on Malimg dataset, 97.78% accuracy is obtained which is outperformed most of the ML-based malware detection method.

Effect of dehydration and packing techniques on the quality of guava supari

Guava (Psidium guajava L.) fruit is rich in carbohydrates, fibre, vitamin-C, pectin and minerals. Guava supari was prepared using three different dehydration techniques, viz. solar drying, cabinet drying and freeze drying. The product was packed in laminated aluminum foil with and without nitrogen flushing. It was stored at room temperature for six months and analyzed for different physico-chemical attributes at each month. The results revealed that freeze drying was the best technique for better retention of nutraceutical elements like ascorbic acid, phenolics and total anti-oxidant compounds. Cabinet and solar drying resulted in more losses of nutraceutical compounds in increasing order. During storage of product, gradual decrease in ascorbic acid, phenolics and total anti-oxidants as well as sensory scores was observed. However, decline was more sharp in solar and cabinet dried samples than freeze dried samples. The freeze dried product obtained higher score during sensory evaluation of product than cabinet and solar dried samples. Nitrogen flushing influenced quality retention positively as observed by comparative low losses in physico-chemical and sensory characteristics of guava supari during storage. Non-enzymatic browning of supari was also found to be least in case of freeze dried nitrogen flushed samples. Overall, Freeze drying coupled with nitrogen flushing was found to be the best technique for preparation and storage of guava supari.

Bypassing Anti-Analysis of Commercial Protector Methods Using DBI Tools

As most malware is infectious, anti-analysis and packing techniques supported by commercial protectors are conventionally applied to hinder analysis. When analyzing to detect and block such protected malware, it is necessary to do so in a virtual environment to prevent infection. In terms of packing, it is necessary to analyze using dynamic binary instrumentation (DBI), a dynamic analysis tool, which is advantageous for unpacking because DBI inserts code at run time and analyzes it dynamically. However, malware terminates on its own when it detects a virtual environment or DBI due to anti-analysis techniques. Therefore, it is necessary to also bypass anti-VM and anti-DBI techniques in order to successfully analyze malware in a virtual environment using DBI. It is very difficult for analysts to bypass anti-VM and anti-DBI techniques that are used in commercial protectors because analysts generally have little information on what methods are used or how to even bypass these techniques. In this paper, we suggest guidelines to aid in easy analysis of malware protected by anti-VM and anti-DBI techniques supported by commercial protectors. We analyzed the techniques used by five of the most common commercial protectors, and herein present how to bypass anti-VM and anti-DBI techniques supported by commercial protectors via a detailed algorithm analysis. We performed a bypass experiment after applying each commercial protector to 1573 executable files containing vulnerabilities provided by the National Institute of Standards and Technology (NIST). To our knowledge, this is the first empirical study to suggest detailed bypassing algorithms for anti-VM and anti-DBI techniques used in commercial protectors.

Optimization and analysis of gravel packing parameters in horizontal wells for natural gas hydrate production

Horizontal well is preferred for marine natural gas hydrate (NGH) production, while a robust completion method is required to control the associated sand production. In this paper, technical challenges, evaluation workflow, and deployment constraints of gravel packing in horizontal wells for marine NGH production are comprehensively analyzed. A virtual horizontal well located at the site SH2, northern South China Sea is involved to optimize packing operation parameters and analyze factors that affect the safety and effectiveness of packing operation. The results indicate that the extremely narrow safe operational window and high fluid-loss ratio are the main obstacles that affect packing effectiveness in marine NGH production horizontal wells. The safe operational window becomes narrower with the decrease of hydrate saturation within the reservoir; hence, the packing failure risk increases significantly. As for the virtual horizontal well located at the site SH2, the safe operational windows are 1.38–1.56 m3/min and 1.38–1.82 m3/min given the average hydrate saturation is 30% and 70%, respectively. However, the horizontal well is unpackable when hydrate saturation is less than 15%. Furthermore, the maximum packable lengths in horizontal wells for marine NGH production are found to be affected by hydrate saturation, fluid-loss ratio, gravel density, gavel concentration, and density/viscosity of sand-carrier. A joint application of lightweight gravel, low concentration slurry, viscosity reducer additives, and multiple β-wave packing technique could prolong the maximum packable length.

Off-clamp Retroperitoneoscopic Tumour Evacuation for Sporadic Renal Angiomyolipomas with High RENAL Nephrometry Scores: A Novel Surgical Technique and Its Outcomes

BackgroundPartial nephrectomy or angioembolisation is commonly used for sporadic renal angiomyolipomas (RAMLs) with high RENAL scores, but there is a risk of reduced renal function, postoperative complications, and recurrence. ObjectiveTo describe a new technique for off-clamp laparoscopic evacuation of sporadic RAMLs with high RENAL scores that promotes maximal renal function maintenance and low postoperative complication and lesion recurrence rates. Design, setting, and participantsA retrospective cohort of patients undergoing off-clamp laparoscopic evacuation for sporadic RAMLs with RENAL scores ≥9 from January 2013 to June 2018 was included. Surgical procedureWe highlighted the curettage, suction, packing, and binding (CSPB) technique, a new off-clamp retroperitoneoscopic evacuation technique for sporadic RAMLs. MeasurementsDemographics, preoperative, intraoperative, and postoperative outcomes were assessed. Results and limitationsA total of 141 cases were included. The median (interquartile range [IQR]) tumour size was 7 (6.2–8.2)cm. The median (IQR) RENAL score was 10 (9–11). The median (IQR) operative time was 80 (65–125) min, with a median (IQR) estimated blood loss of 130 (90–362.5)ml. Conversion to neither open surgery nor standard laparoscopy occurred. The warm ischaemia time was zero for all cases. Postoperatively, 13 minor complications (Clavien grade 1) were recorded. No blood transfusions were reported. The glomerular filtration rate did not change significantly from preoperative period to 12-mo follow-up. Recurrence did not occur at the median follow-up period of 48 (36–60) mo. The retrospective design and lack of a control group are limitations of this study. ConclusionsOff-clamp retroperitoneoscopic tumour evacuation using the CSPB technique is feasible, safe, and effective for treating complex sporadic RAMLs. Patient summaryWe report a curettage, suction, packing, and binding technique for off-clamp retroperitoneoscopic evacuation of sporadic renal angiomyolipomas that leads to complete lesion clearance, excellent renal function preservation, and minimal perioperative complications.

The effect of breathing technique on sticking region during maximal bench press

The intrathoracic pressure and breathing strategy on bench press (BP) performance is highly discussed in strength competition practice. Therefore, the purpose of this study was to analyze whether different breathing techniques can influence the time and track characteristics of the sticking region (SR) during the 1RM BP exercise. 24 healthy, male adults (age 23 ± 2.4 yrs., body mass 85 ± 9.2 kg, height 181 ± 5.4 cm) performed a 1 repetition BP using the breathing technique of Valsalva maneuver (VM), hold breath, lung packing (PAC), and reverse breathing (REVB), while maximum lifted load and concentric phase kinematics were recorded. The results of ANOVA showed that the REVB breathing decreased absolute (p < 0.04) and relative lifted load (p < 0.01). The VM showed lower (p = 0.01) concentric time of the lift than the other breathing techniques. The VM and PAC showed lower SR time than other breathing techniques, where PAC showed a lower SR time than VM (p = 0.02). The PAC techniques resulted in shorter SR and pre-SR track than other breathing techniques and the REVB showed longer SR track than the other considered breathing techniques (p = 0.04). Thus, PAC or VM should be used for 1RM BP lifting according to preferences, experiences and lifting comfort of an athlete. The hold breath technique does not seem to excessively decrease the lifting load, but this method will increase the lifting time and the time spend in the sticking region, therefore its use does not provide any lifting benefit. The authors suggest that the REVB should not be used during 1 RM lifts.

A Randomized Controlled Trial of Novel Loop Drainage Technique Versus Standard Incision and Drainage in the Treatment of Skin Abscesses.

The objective was to compare the failure rate of incision and drainage (I&D) with LOOP technique versus I&D with standard packing technique in adults and children presenting to the emergency department (ED) with subcutaneous abscess. This prospective, randomized controlled trial (NCT03398746) enrolled a convenience sample of patients presenting to two Level 1 trauma centers over 12months with skin abscesses. Of 256 patients screened, 217 patients were enrolled, 109 randomized to I&D with packing (50%) and 108 (50%) to I&D with LOOP. The primary outcome was treatment failure defined by admission, IV antibiotics, or repeat drainage within 10-day follow-up. The secondary outcomes included ease of procedure, ease of care, pain, and satisfaction using a 10-point numeric rating scale. There were no differences in patient characteristics between groups. Follow-up data were available in 196 (90%). Treatment failure occurred in 20% (range= 12%-28%) of packing patients and 13% (range= 6%-20%) of LOOP patients (p=0.25). There were no significant differences in failure rates in adults (p=0.82), but there was a significant difference in children (age ≤ 18 years) at 21% (range = 8%-34%) in the packing group and 0 (0%) in the LOOP group (p=0.002). Operators reported no significant differences in ease of procedure between techniques (p=0.221). There was significantly less pain at follow-up in the LOOP group versus packing (p=0.004). The wound was much easier to care for over the first 36hours in the LOOP group (p=0.002). Patient satisfaction at 10days postprocedure was significantly higher in the LOOP group (p=0.005). The LOOP and packing techniques had similar failure rates for treatment of subcutaneous abscesses in adults, but the LOOP technique had significantly fewer failures in children. Overall, pain and patient satisfaction were significantly better in patients treated using the LOOP technique.

Effectiveness of Multi-Modal Blood Management in Bernese Periacetabular Osteotomy and Periacetabular Osteotomy with Proximal Femoral Osteotomy.

ObjectiveBernese periacetabular osteotomy (PAO), an effective treatment for patients with developmental dysplasia of the hip (DDH), is characterized by wide exposure, cancellous bone surgery, and difficult techniques. In addition, the hip joint is deep and of rich muscles and neurovascular supply, which significantly increases bleeding. For patients who had combined proximal femoral osteotomy (PFO), the blood loss may be tremendous. The blood management for PAO is still challenging. We aimed to evaluate the effectiveness of multi‐modal blood management for PAO and PAO combined with PFO.Patients and MethodsWe retrospectively evaluated patients who had PAO with or without combined procedures from June 2010 to December 2018 in our department. The multi‐modal blood management protocol included three parts: (i) pre‐operation – autologous component blood donation and iron supplement/erythropoietin; (ii) during operation – controlled hypotension anesthesia, intraoperative auto‐blood transfusion, tranexamic acid (20 mg/kg, IV / 0.5 g local), and standardized surgical procedure to shorten surgical time; and (iii) post‐operation – no drainage used, selective allo‐blood transfusion, and ice packing technique. As the lacking of the above standard blood management protocol during PAO or PAO + PFO initially, we divided all the patients into three groups: Group A (PAO) – before protocol started, 74 hips; Group B (PAO) – after protocol finalized, 178 hips; Group C (PAO + PFO) – after protocol finalized, 55 hips. The intraoperative blood loss, surgical time, allo‐transfusion rate, pre‐ and postoperative hemoglobin were compared among groups.ResultsBoth the general characteristics and preoperative hemoglobin were comparable among the three groups (P < 0.001). The intraoperative blood loss was 797.1 ± 312.2, 381.7 ± 144.0 and 544.1 ± 249.1 mL, respectively. The surgical time was 109.6 ± 18.5, 80.2 ± 20.0 and 154.3 ± 44.7 min, respectively. The allo‐transfusion rate was 86.5%, 0%, and 2%, respectively. The mean decreased value of hemoglobin on the first postoperative day of group B and group C was greater than that of group A, which was associated with the higher allo‐transfusion rate of group A. However, on the third postoperative day, the mean decreased value of hemoglobin of group B was less than that of group A and group C.ConclusionPerioperative multi‐modal blood management for PAO or PAO + PFO can significantly decrease intraoperative blood loss, reduce allo‐transfusion rate from over 80% to 0%, and ensure the rapid recovery of postoperative hemoglobin level.

Influence of Oscillating Packing Instrument on Microhardness of Bulk-Fill Composite: In Vitro Study

AIM: This study aimed to assess Vickers microhardness of Tetric EvoCeram Bulk Fill composite that was packed manually and using oscillating packing device.&#x0D; MATERIALS AND METHODS: Two different packing techniques were applied on Tetric EvoCeram Bulk Fill composite. For each packing technique, ten specimens (6 mm in diameter and 4 mm height) were prepared using a black-shaded Teflon mold. The resin was inserted in a bulk increment either packed manually or using Compothixo oscillating device and then light-cured for 40 s. Microhardness was analyzed at the top and the bottom surfaces.&#x0D; RESULTS: Overall, for both packing techniques, microhardness decreased significantly with the increase of depth. Tetric EvoCeram Bulk Fill composite when packed either manually or using oscillating device, did not show significant difference neither at the top surfaces of both applied techniques nor at the bottom surfaces of both applied techniques.&#x0D; CONCLUSION: Different packing techniques did not influence the microhardness of Tetric EvoCeram Bulk Fill composite.&#x0D;

Privacy-Preserving Outsourced Calculation Toolkit in the Cloud

In this paper, we propose a privacy-preserving outsourced calculation toolkit, Pockit, designed to allow data owners to securely outsource their data to the cloud for storage. The outsourced encrypted data can be processed by the cloud server to achieve commonly-used plaintext arithmetic operations without involving additional servers. Specifically, we design both signed and unsigned integer circuits using a fully homomorphic encryption (FHE) scheme, construct a new packing technique (hereafter referred to as integer packing), and extend the secure circuits to its packed version. This achieves significant improvements in performance compared with the original secure signed/unsigned integer circuit. The secure integer circuits can be used to construct a new data mining application, which we refer to as secure $k$ k -nearest neighbours classifier, without compromising the privacy of original data. Finally, we prove that the proposed Pockit achieves the goal of secure computation without privacy leakage to unauthorized parties, and demonstrate the utility and efficiency of Pockit.

Clinical efficacy of coil embolization in treating pseudoaneurysm post-Whipple operation.

The present study aimed to evaluate the clinical efficacy and safety of angiography and coil embolization for pseudoaneurysm post-pancreatoduodenectomy (PD). A total of 17 patients with gastrointestinal or abdominal hemorrhage after PD were included in the present study. Angiography was performed on the celiac artery, common hepatic artery, splenic artery, gastroduodenal artery and superior mesenteric artery to determine the size of the pseudoaneurysm, the parent artery and its collateral branches. A variety of embolization techniques have been applied to embolize pseudoaneurysm, including the sac packing technique, proximal embolization, exclusion technique and sandwich technique. Different techniques with coils were used for embolization and the clinical effects of embolization were analyzed. A total of 18 pseudoaneurysms were identified in 17 patients. In 2 patients, severe technical complications occurred, including migration of the coil and rupture of pseudoaneurysm, and one of them died, which may have been associated with this complication. No serious clinical complications were observed in the other patients. A total of 7 patients had mild clinical complications, including mild abdominal and dorsal pain, which were alleviated after symptomatic management. A total of 15 patients with definite pseudoaneurysm were successfully embolized without re-bleeding and complications. The clinical success rate was 94.1% (16/17). In conclusion, a variety of embolization techniques may be applied for the treatment of pseudoaneurysm after PD, which have high technical and clinical success rates and small trauma. It is recommended in emergency situations, but care should be taken to avoid serious technical complications.

Envíos Ultramarinos de Plantas y Animales Entre España y sus Colonias en El Siglo XVIII

A expansão da atividade pecuária no Brasil resignificou as relações entre natureza, sociedade e animais não humanos através de projetos e relações de poder na apropriação de espaços naturais. Dentre estes mecanismos de apropriação, ressalta-se, no mundo agrário, a composição social baseada em questões patriarcais e aristocráticas relacionadas à concentração da terra, renda e acesso à tecnologia produtiva, que também hierarquizaram as estruturas de modernização de espaços em um mesmo território regional. Assim, a historicidade da utilização dos campos no Estado de Santa Catarina, permite analisar como determinados biomas foram inscritos em projetos políticos, econômicos e ambientais que estabelecem diferentes relações entre a sociedade local e a natureza, bem como diferentes configurações de espaço e identidade ao longo do tempo e de acordo com a difusão de tecnologias e genética animal que integrou o sul do Brasil ao complexo colonial mercantil pelo Rio da Prata e Oceano Atlântico.

Evaluation of Two Resin Composites Having Different Matrix Compositions

This study compared two resin composites with similar filler systems and different matrix compositions. The depth of cure (DoC), polymerization shrinkage, and marginal leakage were evaluated. A Filtek Bulk Fill resin composite (FB) and a Filtek Supreme resin composite (FS) were used. For the DoC and polymerization shrinkage, cylindrical specimens with different thicknesses were prepared. The DoC was attributed to the bottom/top ratios of Vickers microhardness numbers. For polymerization shrinkage, each specimen was firstly scanned using micro-computed tomography (µCT) then cured for 20 s, then for 10 s, and then for 10 s, and they were rescanned between each curing time. Data were processed using the Mimics software. For marginal leakage, standardized 5 mm cavities were prepared in 90 molars. After etching and bonding, materials were packed according to groups: FB-bulk, FB-incremental, and FS-incremental, which were cured for 20, 30, and 40 s, respectively. After thermo-cycling, teeth were stored in 1% methylene blue dye for 24 h and then sectioned and observed for dye penetration. The results showed insignificant differences in the shrinkage and leakage between the different packing techniques and curing times of both materials. In conclusion, the introduction of a novel matrix into resin composite composition enabled bulk-filling in one layer up to 5 mm deep while keeping a tolerable polymerization shrinkage.

PackerGrind: An Adaptive Unpacking System for Android Apps

App developers are increasingly using packing services (or packers) to protect their code against being reverse engineered or modified. However, such packing techniques are also leveraged by the malicious developers to prevent the malware from being analyzed and detected by the static malware analysis and detection systems. Though there are already studies on unpacking packed Android apps, they usually leverage the manual reverse engineered packing behaviors to unpack apps packed by the specific packers and cannot be appified to the evolved and new packers. In this paper, we propose a novel unpacking approach with the capacity of adaptively unpacking the evolved and newly encountered packers. Also, we develop a new system, named <monospace xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">PackerGrind</monospace> , based on this adaptive approach for unpacking Android packers. The evaluation with real packed apps demonstrates that <monospace xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">PackerGrind</monospace> can successfully reveal packers protection mechanisms, effectively handle their evolution and recover Dex files with low overhead.

ANALISIS FRAMING BAHASA BERITA TINDAK KRIMINAL PADA MEDIA MASSA

The problem in research, namely how is the choice of words in mass media framing of crime news? What are the techniques and models of mass media framing of crime news? What is the response of the community to the use of non-criminal news language and its influence on society? This study aims to describe and inventory the concept of the crime language news framing in the mass media. The concept of framing described is related to the choice of words in mass media framing, techniques and models of mass media framing of crime news and public response to the use of non-criminal news language and its influence on society. The method used in this study consists of three stages, namely the stage of data collection, the stage of data classification, and the stage of data analysis. Data obtained from print media mass media. Technically, this research was conducted using the method of listening and proficient methods in providing data. The proficient method can be compared with the interview method. In data analysis, editing, coding, and matching methods are used. Based on data analysis, the choice of words in the language of news framing of crimes is generally in favor of the victim. News writers choose words that can accompany the reader's mind to sympathize with the victim. In addition, the focus of the news is framing with cognitive, empathy, and packing techniques. The framing model in crime news language has four structural dimensions of news text as a framing device, namely syntax, script, thematic, and rhetorical. Keyword: framing, language, crime news, and mass media

Secure and Efficient Outsourced k-Means Clustering using Fully Homomorphic Encryption With Ciphertext Packing Technique

Nowadays, more individuals and corporations tend to use machine learning as a service (MLaaS) in cloud computing environment. However, when enjoying the pay-as-you-go mode and flexible capacity of cloud computing, it also increases the risk of privacy leakage for sensitive data. In this paper, we aim to efficiently implement privacy-preserving MLaaS, and focus on k-means clustering over outsourced encrypted cloud databases. Previous works mainly utilize partially homomorphic encryptions, which require a great number of interactive protocols with high computation and communication costs, making them not practical in real-world applications. To better solve this problem, we propose a new secure and efficient outsourced k-means clustering (SEOKC) scheme using fully homomorphic encryption with ciphertext packing technique, which achieves parallel computation without extra cost. The proposed scheme preserves privacy in three aspects: (1) database security, (2) privacy of clustering results and (3) hiding of data access patterns. We provide formal security analysis and evaluate the performance of the proposed scheme through extensive experiments. The experiment results show that our scheme needs much less computation cost (more than three orders of magnitude lower) than the state-of-the-art schemes, and is suitable to be applied on large databases.

DroidPDF: The Obfuscation Resilient Packer Detection Framework for Android Apps

The Android packing techniques were originally used to pack and conceal important information of the apps to prevent malicious developers from deconstructing the software logic. However, due to the lack of supervision, packing techniques have become the common methods for Android malwares to harden apps and circumvent virus detection engines in recent years. With obfuscation and encryption techniques, packing engines can alter the code structure of malwares and hide the malicious code to deceive and bypass the detection mechanisms, such as signature matching. For packing techniques, the packers are the agents created by packing engines and used to protect the softwares. Hence the packers pose a major challenge to the automated malware detection when researchers analyze a large collection of Android apps statically. It is necessary to identify packed samples in advance so that researchers can adopt different process procedures. To address this problem, we propose an intelligent AnDroid Packer Detection Framework called DroidPDF. It adopts a concise feature set that is resilient to obfuscation techniques. It also introduces weighted entropy to improve the detection effectiveness and achieves an average F1 Score of 0.9870.

VCF: Virtual Code Folding to Enhance Virtualization Obfuscation

Code virtualization, also called virtualization obfuscation, is a code obfuscation technique that protects software from malicious analysis. Unlike code packing or code encryption techniques, code virtualization does not restore the original code on the memory. However, because basic components of the structure are simple, if a virtualization structure is revealed statically, there is a limitation in that the analysis process is somewhat constant. In this paper, we propose Virtual Code Folding (VCF) as a new code virtualization technique. The proposed method reduces the amount of virtual code that is statically revealed by folding the virtual code inside a virtualization structure and enables the virtual code to be decoded by generating multiple diversified dispatchers. The folded virtual code is restored by the random key, and then fetched and decoded by the diversified dispatcher. This process makes it possible for VCF to effectively obfuscate correspondence between virtual code and handler code (i.e., code that performs real functionality) without significant performance overhead or strong assumptions.